const _ = require('lodash')

let str = 'wei_di_NEVER_DIE'
let fn1 = function(str){
   return  function(){
       _.toUpper(str)
   }
}

let fn2 = function(str){
   return  function(){
       _.lowerFirst(str)
   }
}

let fn = _.flowRight(fn2,fn1)
fn(str)